Write/Wrote/Writing – When Should I Use Each?
In what situations do you use "I write," "I wrote" & "I am writing?" Please explain.
First of all, for the complete and thorough data please visit:
English Verb Tenses section.
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Now, regarding your specific questions:
Use "I write" when the writing takes place at the present.
"I write every day."
"I write very well."
And so forth.
Use "I am writing" when you are actually doing the writing action. Or in other words: when you are in the middle of writing.
"I am writing right now."
"This week I am writing my research paper."
Use "I wrote" when the writing took place in the past.
"I wrote you a letter last week."
"I wrote my research paper a year ago."